Dipper for power shovels and the door mounting means therefor



July 24, 1951 P. v. LARSEN DIPPER FOR POWER SHOVELS AND THE DOOR MOUNTING MEANS THEREFOR Filed March 23, 1950 i zz rzfafl Paul Z/ lay 5672 5 126M153 9 July 24, 1951 P. v. LARSEN 2,561,518

DIPPER FOR POWER SHOVELS AND THE DOOR MOUNTING MEANS THEREFOR 2 Sheets-Sheet 2 Filed March 25, 1950 JZ/ZWQ/Z for fiazz/ Zl iczri gz 73/ 4214,; g

Patented July 24, 1951 DIPPER FOR POWER SHOVELS AND THE DGQR MOUNTING MEANS- THEREFOR Paul V. Larsen, Portland, Greg, assignor to Elect'ri'c Steel Fbiindry, Portland, 'Oregn, a. corporation of Oregon Application March 23, 1950;.Serial No. 151,491

This invention relates to improvements .in a

dipper tor a power shovel and particularly to r'neans for providi'n'ga resilient mounting of great "strength and great durability for the door structure of the dipper, and it has for its object the provision of a new and improved form and arrangement of parts whereby the desired resilieri'cy and strength are provided. In a construction of. this type. ihvol'ving'a'heavy metal door whose operative movements with respect to the dipper are controlled by gravity and by flipping oi snappingrnoveme'nts of the dipper or shovel on the end of a heavy supporting and operating beam, it ishighly important that the contacting and supporting parts of the structure shall be of great strength and" of great durabnity. At .the' same time, it is important that there shall he provision for a substantial amount of yieldin thestructure for cushioning the impact of the relatively movable parts sons to protect the parts from being pounded to pieces by the shock from often repeated blows.

It is one of thepbjects of th'is inventionito provise an improved form of connection between thedo'or of astructure of this typ and the'hinge bars by which the door is movabl'y supported in position whereby the door is permitted to have a limited-movement with respect to the barsand whereby a resilient stoppage'of the movement of he door is assured at the'e'nd' of a movement of thedoor into its closedpo'sitioh. I have attained {this object by the provision of an improved arrangement of parts, comprising a strip ofrubber or other resilient material interposed between impact" and supporting elements, such strip of yielding material servingnot o'nly torelieve the blows incident to normal operation and to take the heavy pressure of parts brought forcibly to"- g'ether, but also to accommodate and take care of slight irregularities in the formation of the parts whereby thenecessity for accurate machin ing in the manufacture of such parts ma be avoidedt It is another object of my'invention to provide an im roved arrangement of the connecting means between the door and the hinge tars whereby the use of rivets; bolts, welded joints and the like may be avoided. I have accomplished this object in the construction shown by. the" use of an improved arrangement of connecting "means; com rising: holding mocks preferably in the form of wedge members coo erative with heavy'asso'ciated'parts for pressing the door into en agement with the hinge bars, together with ,heavvlug and socket means for holding the door 17' Claims. (011' 214- 145) position longitudinally of the hinge bars, and

heavy side bearing tace parts for controlling. the

position of the door transversely of the hinge bars. 3 All of this mechanism is arranged for permitting a slightamount of movement of the door with. respect to. the hinge bars so as to provide for the easy fitting of the parts together, while at the same time serving to hold the door very strongly in operative position with respect to the body of the dipper or shovel.

Other objects and advantages of the invention will be apparent from the following description andthe accompanying drawings, in which similar characters of reference indicate s'iin'ilar parts throughout the several views.

Referring to the two sheetsof drawings,

Fig. 1 is a Side face iew of a dip er mounted on a power shovel stick and embodying ni'y'i'mproved construction;

Fig. 2 is a sideface vlewfof one of the hinge bars of the structure shown in Fig. 1; with the dip er door mounted thereon; such parts being turned for convenience of illustration through a 90 angle as compared with their position in Fig. 3 is a cross sectional view taken at the line- 3-3 in Fig. 2; Fig. 4 is a bottom iaceview ofone sidepo'rtion of my improved dipper door mounted on a hinge bar as shown in Fig. 2, with the end portion of the bar broken away at theright;

Figs. 5, 6 and 7 are vertical sectional views taken respectively on the line 5=-5, the line 6-6 and the line 'l--1 of Fig.4; and

Fig. 8 is an outside face View of a portion of the hinge bar asshown in Fig. 4- but with the associated parts removed for clearness of illustratien.

Referring now to the several figures of the drawings, 12 indicates the body of a dipper of a conventional-type mounted on the end of a power shovel stick as is illustrated in Fig. 1. As isusual 'in str'ucturesot this type, a dumping door M is mounted at the rear'face of the dipper in posiso asto yield readily'when released for dumping thecont'ents of the dipper. This door 14 comprises a heavy metal plate l5 extending from sideto side and from topto bottom of the load carrying chamber of the dipper, as is usual in constructions of. this type, being movably mounted on thefdipper' through the mediumoi heavy hinge bars it and led at opposite sides of the door, only one of the two similarly arranged hinge bars and associated parts being shown in detail in the drawings. In my improved arrangement, the hinge bars it and i561. have the usual goose-neck formation, with the short arm portions of the bars pivotally connectedwith the dipper by means of heavy axis pins If, as shown in Fig. 1. Heavy laterally extending flanges 5b are provided on the hinge bars at the faces adjacent to the door.

In my improved arrangement, cushioning members IS in the form of elongated strips of rubber or other suitable material are interposed between the outer face of the door plate l5 and the inner faces of the bars l6 and 16a for relieving the severity of the impact when the door is brought forcibly to its closed position or when a heavy rock or the like is thrown against the ,inner face of the door. These cushioning strips are preferably cut from woven standard rubber belting material whereby great durability "is'assured along with the requisite degree of refsiliency for taking upthe shock of the blow of the door against the dipper. In the arrangement shown, short lengths 19 of the strip material are employed at the edge portion of the door to [supplement the action of the strips l8, such short 20 at opposite sides of the door are effective by engagement with the ;grocves ;32 for holding the "door from movement in either "direction longitudinally of the hinge bars l6 and 16a.

lengths being employed beyond the positions of transversely extending lugs or ribs 20 at opposite sides of the door as hereinafter described.

jIThe means utilized for connecting the door M to the hinge bar at either side of the door com- "prises a comparatively large heavy metal holding block 2| preferably in the formof awedge engaging the outer face of the hinge bar near its free end, and comparatively heavy metal holding blocks 22 and23 preferably in the form of wedges engaging the outer faces of the flanges lBb at 24 where. the flanges are made wider for supporting J the blocks. v Y, s The improved means 'I have'employed-in' con- 'n'ection with the wedge member 2| for holding it pressed against the outer face of the hinge, bar I6 I,

comprises bracket means in the form of a yoke 25 formed integrally with the door plate IE on its outer face in position to straddle the hinge bar, ,with reinforcingwebs 26 at opposite sides of the yokefor strengthening the construction. With the hinge bar 16 extending through the yoke by insertion from the right in Figs. 2 and 4, the wedge 2| is driven into positionfrom the left between the cross bar section 21 of the yoke and the ,outer face of the hinge bar, the wedge being vmaintained in operative position by a bolt 28 having a nut 29 thereon pressing on the outer face of a lug 36 extending outwardly from the I outer face of the hinge bar. Asis clearly shown in Figs. 2 and 5, the outer face of the bar [6 is rowned slightly at 3| and the inner face of the wedge is correspondingly shaped, serving to expedite the easy assembly of the parts in their operative positions and to insure the desired cooperative action between the -hinge bar and the wedge.

As is set forth above and as is shown in Fig. 2 of the drawings, the plate [5 of the door [4, at a point near the outer edge of the door, is provided with a transversely extending lug or rib 20 projecting from the outer face of the door, such lug having in effect a tongue and groove connection with a transversely extending groove or socket 32 provided in the inner face of the hinge bar. It will be understood that when the bar I6 is bein inserted through the yoke 25'the groove 32 can The means employed in connection with the elongated wedge members 22 and 23 for holding them pressed against the outer faces of the widened flange portions 24 of the hinge-bars at opposite sides thereof is best shown in Fig. 3. As shown in that figure, the wedge members 22 and 23 bear at theirinner faces against the laterally 1 extending flange portions 24 of the hinge-bars,

with the cross bar portions 34 of brackets 35 engaging the outer faces of said wedge members, said brackets 35 being mounted fixedly in position on the outer face of the door plate l5. Said wedge members 22 and 23 engage the outer faces of the flanges 24 throughout the full width of said flanges, and the bearings of the wedge members on the flanges are substantially as long, longitudinally of the hinge-bars, as their width transversely of said bars. The arrangement is 'suchithat whensaid wedge members are driven to thelirnit'of their movement toward the right in Fig. 2, for insertion between the'brackets 35 andthe hinge-bars, the door It and the hingebars are held very strongly in operative relationship "to each other. In thisarrangement, the wedges 22 and 23 areheld in their operative'posi- .tions by bolts 36 passing through the'wedge members longitudinally thereof and having nuts 31 on their end portions adapted to be tightened against the faces of laterally extending lugs 38 carried by the hinge-bars at opposite sides thereof, as is clearly shown in Fig.7. f j

The arrangement of the b1 ks 2], 22 and23 and the holding parts with which said blocks have sliding engagement is such in my improved construction that they provide bearings of coniparatively large size' through which pressure is applied effectively from .thedoor ,to the hinge.-

bar's. With the holding blocks 2| extending lat.-

the flanges of the hinge-bars at 24, and with the .bearingfaces of the several wedge blocks 2!,22 and 230i at least substantially as .great length longitudinally of the hinge bars as their width, the application vof pressure onthe door and other parts .of the dipper. is effected with very. little if vany tendency forany of theparts to be distorted or to become loosened, and with very little likeli; hood that any of the parts shall be broken during long periods ofexceedingly hard usage. For enabling this result to be broughtabout, I have preferably employed manganese steel castings for the production of the door and the hinge-bars. with the critical high strength and high tension parts thus formed of that material without the use of inserts, either removable or otherwise,for such critical parts, but it will be understood that this arrangement involving integralformation of the parts may be departed from, if desired.

neonate of each of the hinge-bars in position to engage the: side edge faces of the hinge-bar in substantially spacedrelationship to the lugs 39?. Thelugs or each pair are: sospaced with respect to each other as to permit limited movement of thedoor transversely with respect to the hinge-bars but so as very strongly to resist such transverse movement of the door beyond the desired limits, so long as the hinge-bars are held in their operative positions with respect to the door by the connections comprising the brackets and the holding blocks or wedges.

By the use of this construction; involving my arrangement of cushioning means and my improved arrangement of broadfaced holding parts, whereby the necessity for the use of bolts or rivets or welded joints is avoided, I am enabled without the use of excessively heavy elementsto provide an operative structure which is adapted to work satisfactorily for a very long time without the necessity for frequent repairs or replacement of parts, in which structure the parts are protected from the danger ofdamage which (might bebrought about bythe blows of theparts against each other. My improved connections between the door and the hinge bars are such as to prevent injury by reason of the loosening of any of the holding parts, the wedge members with their broad bearing faces in contact with correspondingly broad bearing parts being highly efiective for combatting wear and breakage in the operation of the machine.

While I have illustrated a preferred embodiment of my invention, many modifications may be made without departing from the spirit of the invention, and I do not wish to be limited to the precise details of construction set forth, but desire to avail myself of all changes within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a door for the dipper of a power shovel, the combination of a closure plate, hinge-bars extending across the outer face of said closure plate, resilient means serving to cushion the closure plate with respect to said hinge-bars so as to permit the closure plate to move bodily toward the hinge-bars upon the application of heavy pressure on the plate toward said bars, and con nections between said closure plate and said hinge-bars adapted to permit movement of the closure plate toward the hinge-bars against the force of the resiliency of said cushioning means and comprising brackets rigidly mounted on said plate and extending outwardly therefrom into position to overlie portions of said hinge-bars, and holding members in the form of blocks interposed between the overlying portions of said brackets and said hinge-bars serving very strong- 1y to limit movement of the closure plate in the direction away from the hinge-bars.

2. In a door as specified in claim 1, the holding blocks being of comparatively great width and length so as to have effective engagement with the outer faces of the hinge-bars throughout substantially the full width of the hingebars and throughout at least as great a length as width.

3. In a door as specified in claim 1, the combination being further characterized by ribs on theclosure' plate extending transversely of the plates on, its: outer face and having, a working fit in-grooves on the hinge-bars for holding the closure; plate against any substantial. movement longitudinally ofvthe-hinge bars. while said hinge bars are held in operative position by said hold:-

ing, members. v

A. In a door as specified in claim 1, the resillent; cushioning; means being in the form of elongated strips of rubber belting type of material interposed between the outer face of the closure plate and the inner faces of said hinge-bars.

5..In a door as specified. in claim 1,. at least someof said, brackets being in the form of yokes extending into position to straddle said hinge bars" with at least some of the holding members bearing, on the outer faces of the hinge-bars. and extending across, substantially the full width of suchouter faces of said hingebars. ,6. In. a door asspecified in. claim 1, the hinges bars being provided with laterally extending flanges against, the outer faces of which some of the holding; members bear across substantially the full; width of the flanges.

'1. Ina door as specified in. claim 1, at. least some of said bracketslbeing in the form of yokes extending into: position to straddle the end porvtions of said hinge-bars and the hinge-bars be;- ing provided with laterally extending flanges at their face portions adjacent to the closure plate. with some of said holding members bearing on said yokes and on the outer faces of the hingebars across substantially the full width of the hinge-bars, and with the others of said holding members bearing on others of said brackets and on the outer faces of said flanges across substantially the full width of said flanges.

8. In a door as specified in claim 1, each of the hinge-bars being held against any substantial movement laterally with respect to the plate by lugs on the plate in position to engage side face portions of the hinge-bar while said hinge-bar is held in operative position by said holding means.

9. In a door as specified in claim 1, each of the hinge-bars being held against any substantial movement laterally with respect to the plate by two sets of lugs on the plate in spaced position with respect to each other longitudinally of the hinge-bar and in position on the closure plate to engage side face portions of the hinge-bar while said hinge-bar is held in operative position by said holding members.

'10. In a door as specified in claim 1, the combination being further characterized by tongue and groove connections between the closure plate and the hinge-bars for holding said closure plate against any substantial movement longitudinally of the hinge-bars.

11. In a door as specified in claim 1, the blocks being in the form of elongated wedge members slidably mounted in position between the overlying portions of the brackets and the hinge-bars.

12. In a door as specified in claim 11, each of said elongated wedge members being held in operative holding position with respect to one of said hinge-bars by means comprising a bolt extending longitudinally through the wedge membinationot a body membena door member in the form of la'closure plate atone-face of the body (member, hinge means comprising hinge bars extending across the outerface of-"said closure plate, resilient means serving to cushion the closure plate with respect to said hinge bars so as to provide for a limited movement of said closure plate bodily in the direction away from the body of the dipper upon the application of heavy pressure outwardly on the closure plate, and connections between said closure plate and said hinge bars comprising brackets rigidly mounted on said plate and extending outwardlly therefrom into position to overlie portions of said hinge bars, and holding members in the form of blocks interposed between the overlying portions of said brackets and said hinge barsand of comparatively great width and length so as to have'ef- 'fective engagement with the outer faces of the hinge bars throughout at least substantially the full width of the hinge-bars and throughout at least substantially as great length as width.

15. In a structure as specified in claim 14, the

holding blocks being in the form of elongated .wedge members slidably mounted between the overlying: portions. of said brackets and said hinge-bars. r i

11 16. In a structure as specified in claim 14, at I least somefloi the brackets being in the form'. of 'yokes in position to straddle said hinge-bars,.and at least some of said holding blocks being in the form of elongated wedge members slidably mounted between said yokes and the outer faces of said hinge-bars and bearing on said hingebars throughout at least substantially the full width of the hinge-bars.

l 17. In a structurelas specified in claim 14, the

hinge-bars being provided with laterally extend- REFERENCES CITED The following references are of record in the file of this patent: UNITED STATES PATENTS Number Name Date" J a 7 1,981,267 ,Hefielfinger Nov. 20, 1934 2,335,352 Murtaugh Nov. 30, 1943 

